I have a Marq 6 that ive been having problems with ever since i bought it. It breaks paint like crazy.

I go in (it isn't cut to be easily adjusted) and turn the lpr down a little, and it shoots great! i dont have to tester to check the pressures. But then after a while ( 1 or 2 bags) it creeps up and is breaking paint again. Anyone have any ideas to help me out?

Just for the hell of it, I'd mark the LPR adjuster with a sharpie or something, and when it seems like it's creeping up, look inside and see if the adjuster is still in the same place. For it to be turned down and working fine for a bag or two and then creep, only to have you turn it down even more seems like you should have backed out the LPR all the way by now if the knob wasn't moving in between adjustments.